[英]JFrame + JOGL only displays content when resized or minimised + maximised
我目前正在尝试JOGL,但遇到了一个新问题。 启动程序后,我看到一个空白窗口。 调整大小后,通常可以看到它的内容,或者执行最小化/恢复操作。 我想这些事件有些事。 在创建窗口之后,不会调用init() ,而是在第一个具有调整大小或最小化的触发器之后调用。
这是我用于创建窗口和设置OpenGL的代码:
package com.cogwheel.framework.graphics;
import java.awt.BorderLayout;
import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.awt.*;
import javax.swing.JFrame;
import com.cogwheel.framework.init.CWGPreferences;
import com.cogwheel.framework.util.CWGDebug;
import com.jogamp.opengl.util.Animator;
public class CWGOpenGLScreen extends JFrame implements GLEventListener {
private static final String TAG = "CWGOpenGLScreen";
private GLCanvas mCanvas;
private long fpsLast = System.currentTimeMillis();
public CWGOpenGLScreen(){
this.setTitle(CWGPreferences.WINDOW_NAME);
this.setSize(CWGPreferences.WINDOW_SIZE);
this.setLayout(new BorderLayout());
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
///this.setResizable(false);
this.setVisible(true);
CWGDebug.info(TAG, "Window created!");
CWGSetupGL();
}
private void CWGSetupGL(){
GLCapabilities mCaps = new GLCapabilities(null);
mCaps.setHardwareAccelerated(true);
mCaps.setDoubleBuffered(true);
mCanvas = new GLCanvas(mCaps);
mCanvas.addGLEventListener(this);
this.add(mCanvas, BorderLayout.CENTER);
Animator animator = new Animator(mCanvas);
animator.start();
}
public void CWGDrawScene(GLAutoDrawable drawable)
{
CWGCalculateFPS();
GL2 gl = drawable.getGL().getGL2();
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glLoadIdentity();
gl.glBegin(GL.GL_TRIANGLES);
gl.glColor3f(1.0f, 0.0f, 0.0f);
gl.glVertex3f(1.0f / 5 , 0.0f, 0.0f);
gl.glColor3f(0.0f, 1.0f, 0.0f);
gl.glVertex3f(1.0f / 5, 1.0f / 5, 0.0f);
gl.glColor3f(0.0f, 0.0f, 1.0f);
gl.glVertex3f(0.0f, 1.0f / 5, 1.0f / 5);
gl.glEnd();
gl.glFlush();
}
public void CWGCalculateFPS(){
this.setTitle(CWGPreferences.WINDOW_NAME + " [" + 1000 / (System.currentTimeMillis() - fpsLast) + "]");
fpsLast = System.currentTimeMillis();
}
public void init(GLAutoDrawable drawable){
/*GL2 gl = drawable.getGL().getGL2();
gl.glClearColor(0, 0, 0, 0);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glLoadIdentity();
gl.glOrtho(0, 1, 0, 1, -1, 1);
*/
CWGDebug.info(TAG, "Init called!");
}
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height){}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged){}
public void display(GLAutoDrawable drawable){ CWGDrawScene(drawable); }
public void dispose(GLAutoDrawable drawable){}
}
我知道,代码质量很差,还没有时间清理。 对不起
编辑:出现了问题,在未初始化GLEventListener之前,不应该显示JFrame。
我发现了您的错误(与eclipse无关):每当调整画布大小时,您都应该设置视口(调用glViewport)=>因此,您需要在画布中调用glViewport(x,y,widht,height) GLEventListener的reshape()方法。 因此OpenGL总是知道绘制场景的位置,而不仅仅是在调整帧大小时。
另外, 在显示屏幕之前 ,请不要忘记设置屏幕(调用CWGSetupGL())(否则,您仍然会遇到同样的问题,但只需要一点时间)。
这里是修改后的代码(由于您没有提供此类,因此我删除了对CWGDebug.info的调用,但是可以放回它们):
package com.cogwheel.framework.graphics;
import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.JFrame;
import com.jogamp.opengl.util.Animator;
public class CWGOpenGLScreen extends JFrame implements GLEventListener {
public static void main(String[] args) {
new CWGOpenGLScreen().setVisible(true);
}
private static final long serialVersionUID = 635066680731362587L;
private static final String TAG = "CWGOpenGLScreen";
private GLCanvas mCanvas;
private long fpsLast = System.currentTimeMillis();
public CWGOpenGLScreen(){
this.setTitle(TAG);
this.setSize(640,480);
this.setLayout(new BorderLayout());
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
///this.setResizable(false);
CWGSetupGL();
this.setVisible(true);
// CWGDebug.info(TAG, "Window created!");
}
private void CWGSetupGL(){
GLCapabilities mCaps = new GLCapabilities(null);
mCaps.setHardwareAccelerated(true);
mCaps.setDoubleBuffered(true);
mCanvas = new GLCanvas(mCaps);
mCanvas.addGLEventListener(this);
this.add(mCanvas, BorderLayout.CENTER);
final Animator animator = new Animator(mCanvas);
animator.start();
addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
animator.stop();
System.exit(0);
}
});
}
public void CWGDrawScene(GLAutoDrawable drawable)
{
CWGCalculateFPS();
GL2 gl = drawable.getGL().getGL2();
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glLoadIdentity();
gl.glBegin(GL.GL_TRIANGLES);
gl.glColor3f(1.0f, 0.0f, 0.0f);
gl.glVertex3f(1.0f / 5 , 0.0f, 0.0f);
gl.glColor3f(0.0f, 1.0f, 0.0f);
gl.glVertex3f(1.0f / 5, 1.0f / 5, 0.0f);
gl.glColor3f(0.0f, 0.0f, 1.0f);
gl.glVertex3f(0.0f, 1.0f / 5, 1.0f / 5);
gl.glEnd();
gl.glFlush();
}
public void CWGCalculateFPS(){
this.setTitle(TAG + " [" + 1000 / (System.currentTimeMillis() - fpsLast) + "]");
fpsLast = System.currentTimeMillis();
}
public void init(GLAutoDrawable drawable){
/*GL2 gl = drawable.getGL().getGL2();
gl.glClearColor(0, 0, 0, 0);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glLoadIdentity();
gl.glOrtho(0, 1, 0, 1, -1, 1);
*/
// CWGDebug.info(TAG, "Init called!");
}
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height){
GL2 gl = drawable.getGL().getGL2();
gl.glViewport(x, y, width, height);
}
//public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged){}
public void display(GLAutoDrawable drawable){ CWGDrawScene(drawable); }
public void dispose(GLAutoDrawable drawable){}
}
问候 :)
编辑:抱歉,我还没有看到您通过编辑回复自己的问题。 无论如何,我仍然认为您最好在reshape()方法中调用glViewport。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.